What is special with piezo speakers?
How are they different from the regular speakers we all hear music from?
Where can these speakers can be bought, and what is their average cost?
Thank you
Piezo's use a VIBRATION TECHNIQUE which is very good at exciting the airwaves in the higher frequency waves.
They are typically cheaper than MID RANGE, BASS and Sub-woofers.
They kick in about 10Khz and go past where you can hear.
A regular loudspeaker exploits the "motor/generator" effect of a coil of wire suspended in a magnetic field.
When an electric current is passed through the coil a magnetic field is created around it. This field reacts with the field in which the coil is suspended (magnetic attraction and repulsion) and a mechanical force is exerted on the coil - which moves.
The coil is attached to the 'speaker's diaphragm.
The current through the coil comes from the amplifier which drives the 'speaker.
The current is varying in magnitude and frequency, so the coil, and therefore the diaphragm, moves in the same manner, reproducing the amplitude and frequency of the recorded material.
A piezo 'speaker exploits the piezoelectric effect which is exhibited by some crystals, notably quartz and Rochelle salts.
Bossarea Forum - direct box for acoustic into electric guitar amp::
say though that my Fender amp does NOT have a piezo input and maybe that is the the pedal board and the xlr was way different from the fone plugs sound.
http://www.bossarea.com/forum/topic.asp?TOPIC_ID=4876HOME |
diyAudio Forums - Outdoor Soccer Speakers - Page 2::
There were a few different models from parts express last time I looked? How does it sound to you? Thanks, Godzilla. www.ZillaSpeak.com
http://www.diyaudio.com/forums/showthread.php?threadid=129054&pagenumber=2HOME |
If a voltage is applied across a piece of piezoelectric material it will flex, or change dimension in one direction.
In a piezo 'speaker, a piece of piezoelectric material is attached to a diaphragm.
When the signal voltage from an amplifer is applied across the piezo element, its flexure or dimensional movement is transferred to the diaphragm.
The frequency response of piezoelectric material is not very good, particularly at the lower end, that's why they are used as high frequency transducers.
You may be somewhat confused. Most all speakers in use today are piezo speakers. That refers to the permenate magnet on the back of the speaker. In the early days of vacuum tube radios, the speaker had a powered coil on the back that doubled as a choke coil for the power supply. In the case of piezo electronic tweeters, (quite thin in design) they use reed like construction to reproduce very high frequency sounds. In a typical cabnet one use to have a small speaker for highs, a larger one for mid range and a much larger one for base. A better system today would use the reed type tweeter for much more dynamic highs, a horn for mid range and a large, heavy speaker for the base tones as well as special cabinet design for wider range effects.
Pre-Article:Korg Km 402 no xlr out? How do i hook up powered Speakers?
Next-Article:What's the best GPS for your buck?
|
How does piezo speakers different from regular speakers?